Portable power supply



FIG. 1 is a perspective view of a portable power supply, showing our new design;

FIG. 2 is a perspective view with the bottom cover opened thereof;

FIG. 3 is another perspective view thereof;

FIG. 4 is a front view thereof;

FIG. 5 is a rear view thereof;

FIG. 6 is a left side view thereof;

FIG. 7 is a right side view thereof;

FIG. 8 is a top plan view thereof; and

FIG. 9 is a bottom plan view thereof.

FIG. 10 is an enlarged view of a portion of FIG. 1 thereof; and,

FIG. 11 is another perspective view with the bottom cover opened thereof.

The broken lines shown in the drawings illustrate portions of the portable power supply that form no part of the claimed design.

The dot-dash broken lines define the bounds of the claimed design and form no part thereof. 

CLAIM The ornamental design for a portable power supply, as shown and described. 